This was a great episode of It's Always Sunny in Philadelphia, which had several very funny elements all working well together. The title plotline, in which a newly released sex offender looks just like Dennis, or a chubby version of Dennis, was certainly funny. But perhaps even better was the related plotline of Mac's dad being released from prison for the same reason as the sex offender - over crowding.

It's Always Sunny gets a ton of its comedy from its willingness to go very far and very dark in its humor. Certainly that was on display here, with the episode title alone saying it all. But what was great about "Dennis Looks Like a Registered Sex Offender" was seeing them get some huge laughs out of, dare we say it, emotional humor. No worries, it was all done Sunny style, but seeing Mac acting like a little boy who wanted desperately to go the baseball fame with his father was truly hysterical. Rob McElhenney was terrific as he earnestly and enthusiastically would say stuff like "You want to do that with me, dad!?"

Another storyline had Frank decide to move out of Charlie's apartment, because he wanted someone to cook, clean, and have sex with him, or a "bang maid" as he put it. Charlie ended up becoming quite jealous about losing Frank, whose bang maid turned out to be none other than Charlie's mom. Oh, and on top of that, Mac wanted to get his parents back together.

He may look like it, but he's not

All of this led to a big dinner sequence, involving Charlie, Mac, Frank, Charlie's Mom, Mac's Mom, and Mac's Dad. This was a very skillfully done scene, as Charlie worked to sabotage Frank's relationship with his mom by getting her interested in Mac's dad instead. The fact that Charlie's seemingly normal mother was oh-so enchanted to learn that Mac's dad was a drug dealing convict only made things funnier.

The sex offender storyline's best scene involved Dee setting up Dennis, who was sick of being mistaken for the sex offender. What better way to show he was harmless, than for Dennis to take off his shirt and offer to give fitness lessons to kids in the park? While you could see where this was going as soon as it started, as Dee then made the nearby fathers believe Dennis was in fact the sex offender, it didn't make it any less funny. And hey, Dennis deserved the beating those dads gave him... albiet not for anything he did this week.

The ending of the episode involved Mac and Charlie finally realizing Mac's dad was likely killing people he was "taking care of" on a list he'd written in prison, and calling the cops. Of course, as it turned out, they not only were wrong, but Mac's dad was atoning towards people he wronged, and Mac and Charlie's inclusion on that list was because he was going to take them to the baseball hall of fame. But thanks to them calling the cops, Mac's dad was arrested for a parole violation. That would have been a good enough funny/sad ending, but having his dad then tell Mac that now, thanks to Mac turning him in, he actually was going to murder him when he got out again left the episode on a perfect and appropriately dark note.